Sains Malaysiana 46(5)(2017): 743–753

http://dx.doi.org/10.17576/jsm-2017-4605-09

Mechanical Properties of Bitumen Quenched Dual Phase Steel

(Sifat Mekanik Bitumen Lindap Keluli Dual Fasa)

M.O.H. AMUDA^1,2*, T.A. OLANIYAN¹, L.O. OSOBA¹ & E.T. AKINLABI²

¹Materials Development and Processing Research Group (MADEPREG), Department of Metallurgical and Materials Engineering, University of Lagos, Lagos, 101017, Nigeria

²Department of Mechanical Engineering Science, University of Johannesburg, Kingsway Campus

Auckland Park, Johannesburg 2006, South Africa

Diserahkan: 30 Januari 2016/Diterima: 17 Oktober 2016

ABSTRACT

The mechanical properties of Dual Phase Steel (DPS)-duplex structure-produced by quenching in pre-heated bitumen have been investigated. Medium carbon steels intercritically heated at different temperatures and holding times were quenched in hot bitumen. Optical and scanning electron microscopy characterisation of the duplex structure showed extensive network of fibrous martensite in a ferritic matrix with occasional presence of polygonal martensite. The duplex phase structure exhibited continuous yielding dynamics, improving the tensile and hardness values by about 42 and 35%, respectively, relative to the normalised structure. But, the elongation and impact values decreased by about 42 and 50%, respectively, when compared to the normalised structure. These values are similar to those obtained in duplex structure produced using conventional oil quenching. The tensile fractured surface showed transition between a predominantly cleavage mode in the lower annealing temperature to a mixed mode in the upper bound of the annealing temperature. These findings suggest that pre-heated bitumen can be exploited for the production of DPSs.

Keywords: Duplex structure; fibrous martensite; intercritical annealing; tensile fractured surface

ABSTRAK

Sifat mekanik struktur Keluli Fasa Dual (DPS)-dupleks yang dihasilkan melalui pelindapan dalam bitumen pra-panas telah dikaji. Keluli karbon sederhana dipanaskan secara kritikal pada suhu yang dan masa pegangan berbeza telah dilindap dalam bitumen panas. Pencirian mikroskop optik dan elektron imbasan oleh struktur dupleks telah menunjukkan rangkaian luas oleh martensit berserabut dalam matriks ferit dengan sesekali kehadiran poligon martensit. Struktur fasa dupleks mempamerkan hasil berterusan yang dinamik, menambahbaik nilai tegangan dan kekerasan masing-masing sebanyak 42 dan 35%, relatif kepada struktur normalan. Namun, pemanjangan dan nilai impak menurun masing-masing sebanyak 42 dan 50% jika dibandingkan dengan struktur normalan. Nilai ini adalah sama seperti yang diperoleh dalam struktur dupleks yang dihasilkan dengan menggunakan minyak pelindapan konvensional. Permukaan retak tegangan menunjukkan peralihan antara mod belahan pradominan dalam suhu sepuh lindap rendah kepada mod campuran dalam batas atas suhu sepuh lindap. Kajian ini mencadangkan bahawa bitumen prapanas boleh dieksploitasi untuk pengeluaran DPS.

Kata kunci: Martensit berserabut; permukaan retak tegangan; sepuh lindap antara kritikal; struktur dupleks

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*Pengarang untuk surat-menyurat; email: mamuda@unilag.edu.ng